Science: Zoology: Marine mammals

Beluga whales

Marine mammals are mammals that live in the water. They breathe air unlike fish. They include porpoises, otters, seals, sea lions, manatees, dugongs, bears and walruses. They can be found nearly everywhere in the world.

Porpoises include dolphins, orcas, whales, narwhals and porpoises. Here are some cool ways of communication and tracking these animals use. Dolphins use echolocation and whales use songs. Marine mammals can probably hold there breath longer than land mammals.

 Wikipedia: Marine mammals
 Wikipedia: Military Dolphins